1. 1 Math Review: mean, median, mode, range

2. 2 Average Number of Emails  x x x x x x x___x___x_____x__________ 1 2 3 4 5 6 Emails sent today  What is the average number of emails sent today?  Remember to find the average : ADD and Divide  What is the range?  What is the mode?  What is the median?

3. 3 What is the mean?  The mean is the average. It is found by adding all the numbers in a set and dividing by the number of values.  10, 25, 20, 5, 20  The sum is 75.  We added 5 numbers.  Divide 75 by 5.  The average or mean is 15.

4. 4 What is the Median?  The median is the middle number when the data are listed in order.  The number of raisins in our boxes:  10, 26, 26, 27, 30, 32, 32, 32, 34  x  30 is the median.

5. 5 What is the mode?  The mode is the number or numbers that occur most often in the data.  10, 26, 26, 27, 30, 32, 32, 32, 34  The mode is 32.

6. 6 What is the range?  The range is the difference between the greatest and the least number in the data.  10, 26, 26, 27, 30, 32, 32, 32, 34  The greatest number is 34. The least number is 10.  34 – 10 = 24. The range is 24.